Now that Gen2 is stable, I'm sure you're all itching to migrate your Gen1 mods to Gen2. Luckily we thought ahead a little bit and there's a relatively straightforward path to migrate Loom projects. However, for projects targeting Minecraft versions below 1.3 with both a client and server component, there is an extra step.
The most tedious element is updating the mappings, so we made sure the latest Feather gen1 builds are a near perfect match to the first Feather gen2 builds. This way you can let Loom's mappings migration feature do most of the work for you.
The basic premise is as follows: migrate your Gen1 project to the latest Feather gen1 builds, then update the build script for Gen2, et voila! your Gen1 project is now a Gen2 project.